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In addition to responding to DDL events, you can create a trigger to fire for a logon to the SQL Server instance. Logon triggers are fired after authentication succeeds but before the user session is actually established. You cannot return any messages to a user from within a logon trigger. The generic syntax for a logon trigger is

Add data to a DataTable by creating a new DataRow and adding it to the DataTable.Rows collection. Edit data in a DataTable by setting the values of the individual DataColumn objects in a DataRow. Delete rows in a DataTable by calling the Delete method of a DataRow. Monitor and keep track of changes to DataRow objects by using the RowState and RowVersion enumerations. DataTable events are raised as data is changed in specific DataColumn objects or entire DataRow objects. Set the RowError property of a DataRow to indicate a row with an error.

End Function //C# [WebMethod(Description = "Retrieve a list of active vendors ordered by name")]

public string GetVendorList()

CREATE TRIGGER trigger_name ON ALL SERVER [ WITH <logon_trigger_option> [ ,...n ] ] { FOR | AFTER } LOGON AS { sql_statement [ ; ] [ ,...n ] | EXTERNAL NAME < method specifier > [ ; ] }

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The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.

SqlConnection sqlConn; XmlReader rdr;

<logon_trigger_option> ::= [ ENCRYPTION ] [ EXECUTE AS Clause ]

string ret = "";

Answers to these questions and explanations of why each choice is correct or incorrect are located in the Answers section at the end of the book.

//Open the Connection to SQL Server Express string connString = @"server=.\sqlexpress;Integrated Security=SSPI;initial catalog=AdventureWorks"; sqlConn = new SqlConnection(connString);

Logon triggers are used to audit and restrict access. For example, you could limit the number of connections that a user is allowed to make to the instance. If you execute a ROLLBACK statement within a logon trigger, the connection to the instance terminates.

1

sqlConn.Open(); // Return XML data using the FOR XML AUTO clause string sqlString = "SELECT VendorID, AccountNumber, Name, CreditRating " + "FROM Purchasing.Vendor " + "WHERE ActiveFlag = 1 " + "ORDER BY Name " + "FOR XML AUTO "; SqlCommand command = new SqlCommand(sqlString, sqlConn);

178 CHAPTER 5 Programming Microsoft SQL Server with T-SQL User-Defined Stored Procedures, Functions, Triggers, and Views

1. When adding a new row to a DataTable: A. Create an instance of a DataRow and call the Update method of the DataAdapter. B. Create an instance of a DataRow (or typed row), and add it to the Rows col lection of the DataTable. C. Call the DataTable.NewRow method. D. Create an instance of a DataRow.

rdr = command.ExecuteXmlReader();

One of the more difficult tasks that database administrators face, particularly with Web-based applications, is getting all the users out of a database so that maintenance can be performed. No matter how carefully you plan, you inevitably have unexpected connections created. As soon as you kill all the connections to the database, another connection shows up, leading you in an unending circle. One method to lock out access is to disable all the logins; however, you are changing the state of the login, and reenabling the login might cause policy checks to fail, thereby creating an unexpected outage. A better method is to create a logon trigger that rejects logon attempts during your maintenance window. Then, all you need to do is disable the logon trigger following maintenance to return access to normal.

rdr.Read();

7

while (rdr.ReadState != System.Xml.ReadState.EndOfFile) {

For the exam, make sure you know how to retrieve information from within a DDL trigger using the EVENTDATA function.

ret += rdr.ReadOuterXml();

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